I realize that this is a fairly rare problem, but it does still occur (for me anyway).

Symptom 1: Last night will doing a great deal of editing, a banjo track started to "flatline" when I did a "pinch" so that we could see the whole track on one screen.

Symptom 2: suddenly a sound like a cymbal crashing appeared on the banjo track, out of time, randomly, and very loud. I do have a hi-hat in the project as a click track, but it is on a completely different track.

Symptom 3: when trying to load from previous snapshots, some tracks would disappear, with the message "track missing" and a flat line where the track should be.

After extensive research here on the forum, it looks like some folks have had success by creating a brand new project, and then exporting all of the tracks from the corrupt project into the new project. Is that what experts here would recommend? Any other recommendations?

Also, am I correct in understanding that the "Project Clean-Up" feature is no longer a fixed setting that is either automatic, or not? Instead it seems to have been moved to a separate button, so you have to intentionally do it.

What do people recommend about using "Condense Regions" and "Project Clean-Up." From what I've read here, they seem a little dangerous.

It's possible to get missing audio in snapshots if the audio that was used in that snapshot is no longer there in the current project. This can happen if you use Condense Regions, Project Cleanup, or if you manually deleted the audio files with an external program. For important projects, I recommend getting a USB drive or WiFi drive and making regular backups.

Thanks. I was able to recover the corrupted projects by creating a new project and copying all of the tracks from the old to the new project using Dropbox and the Import File command. Seems to have worked fine.

I have bought a Leef iBridge, and will take your advice about using this device for frequent backups.